Abstract: Radiation-curable polyurethane emulsion compositions that can be diluted with water are disclosed. An emulsion of a polyurethane having active amino groups is prepared, and the emulsion is reacted, in the presence of water, with an isocyanate compound having a polymerizable unsaturated group to introduce the polymerizable unsaturated group into the polyurethane. The introduction of a polymerizable unsaturated group into the polyurethane is accomplished in the presence of water, thereby overcoming prior art problems of polymerization and gelation during the preparation of the emulsion. The present invention provides radiation-curable polyurethane emulsion compositions that can be produced on an industrial scale.

Abstract: Ultraviolet radiation-curable primary and secondary coating compositions for optical fibers are disclosed. The primary coatings comprise a hydrocarbon polyol-based reactively terminated aliphatic urethane oligomer; a hydrocarbon monomer terminated with at least one end group capable of reacting with the terminus of the oligomer; and an optional photoinitiator. The secondary coatings comprise a polyester and/or polyether-based aliphatic urethane reactively terminated oligomer; a hydrocarbonaceous viscosity-adjusting component capable of reacting with the reactive terminus of (I); and an optional photoinitiator. Also disclosed are optical fibers coated with the secondary coating alone or with the primary and secondary coatings of the invention.

Abstract: A photopolymerizable rubber being obtained by copolymerizing four compounds consisting of a dienic liquid rubber having hydroxyl groups, an ethylenically unsaturated monomer having hydroxyl groups, a dihydric alcohol having a molecular weight of less than 2,000 and a diisocyanate compound. The photocured product of this composition has higher tensile strength and elongation than that of the prior photopolymerizable rubbers.

Abstract: An excellent ultraviolet ray-curable ink for printing which shrinks little at the time of curing, and exhibits high adhesion, followability, aging-crack resistance, elasticity, elongation, tenacity, chemical resistance, and a scratch resistant property, by a novel ultraviolet ray-curable ink comprising by weight; 100 parts of an ultraviolet ray-curable rubbery copolymer having the general formula ##STR1## wherein R represents an alkylene group having 2-8 carbon atoms, R.sub.1 is H or CH.sub.3, R.sub.2 is a residue of diisocyanate, R.sub.3 is a residue of dihydric alcohol from which at least one or more hydroxyl group is removed, X is a moiety of dienic liquidus rubber having at least one or more hydroxyl groups from which at least one or more hydroxyl groups is removed, l is a number of 1-4, m is a number of 1.0<m<3.

Abstract: Aqueous dispersions of polyurethanes which are crosslinkable by the action of high energy radiation contain (a) a polyisocyanate, (b) a polyol having a molecular weight of from 400 to 6,000 g/mol, (c) if required, a polyol having a molecular weight of from 62 to 399 g/mol, (d) if required, a polyamine having two or more amino groups which are reactive to isocyanate, (e) if required, an aminoalcohol having one or more amino groups which are reactive to isocyanate, (f) a compound containing ionic groups or groups which can be converted into ionic groups and one or more hydroxyl or amino groups which are reactive to isocyanate (g) if required, a monofunctional polyetheral and (h) a compound having one or more ethylenically unsaturated groups and one or more hydroxyl groups. The compound having an ethylenically unsaturated group (h) is used in amounts corresponding to 0.02-0.

Abstract: Acrylic and methacrylic esters of substituted 1,2-bis(phenoxy)-3,3,4,4,5,5-hexafluoro-1-cyclopentenes of the formula ##STR1## in which, in each case independently of one another, R.sup.1 and R.sup.2 denote C.sub.1 -to C.sub.4 -alkyl, C.sub.1 - to C.sub.4 -halogenoalkyl or hydrogen,R.sup.3 and R.sup.4 denote (n+1)- or (m+1)-valent, straight-chain or branched hydrocarbon radicals having 2 to 15 carbon atoms, which may optionally contain 1 to 3 oxygen bridges,R.sup.5 and R.sup.6 denote hydrogen or methyl,X represents ##STR2## and n and m denote integers from 1 to 5The ester can be polymerized to form dental fillings, coatings and artificial teeth.

Abstract: The invention provides a radiation-curable liquid resin for use as a secondary coating of lightwave guides which is a reaction product of (meth)acrylic acid or -acid chloride or isocyanatoalkyl-(meth)acrylate with a 1:2 addition compound of a diepoxide with a mean molecular weight.ltoreq.1000 and a short-chain .alpha.,.omega. -diol with a mean molecular weight.ltoreq.700 or with a 1:2 addition compound of a diepoxide with a mean molecular weight.ltoreq.400 and a monovalent aliphatic alcohol with a mean molecular weight.ltoreq.200, where the diepoxide is an aliphatic-aromatic or aromatic diglycidylether, an aliphatic or cycloaliphatic diepoxide or a silicon-organodiepoxide, and where the short-chain .alpha.,.omega. -diol is an .alpha..omega. -hydroxy-terminated polyoxyalkylene, an .alpha.,.omega. -hydroxy-terminated polyester, an .alpha.,.omega. -hydroxy-terminated polybutadiene, an .alpha.,.omega. -hydroxyterminated organo-functional polysiloxane or an .alpha.,.omega. -alkanediol with a mean molecular weight.

Abstract: Coating Compositions Photocurable coating compositions useful for coating optical glass fibres comprising:(a) a polyethylenically unsaturated polyurethane derived from a polyol having pendent fluoroalkyl groups;(b) an ethylenically unsaturated monomer which is a liquid solvent for the polyethylenically unsaturated polyurethane and is copolymerizable therewith, and(c) a photo-initiator composition.

Abstract: A composition including a mixture of UV curable urethane acrylate and a urethane diacrylate compounds provides an aqueous alkaline developable, flexible solder mask having excellent electrical insulation resistance under hydrolytic testing conditions at elevated temperatures.

Abstract: A photosensitive image-forming material developable with aqueous alkali developers, which is characterized in that the photosensitive resin having the structural units represented by the general formula ##STR1## (wherein A represents a linear polyester structural unit containing in its main chain the dicarboxylic acid unit having a photosensitive, unsaturated double bond adjacent to the aromatic ring, and R.sub.1 represents a tetravalent organic group) is contained in the photosensitive layer.